Pseudomonas aeruginosa is a non-fermenting GNR, it grows on EMB. Which of the following would be true (Circle none, one or many)

a. Pseudomonas aeruginosa would be colorless on EMB

b. Pseudomonas ferments mannitol

c. Pseudomonas ferments lactose

d. Pseudomonas would grow on MSA

e. Pseudomonas would appear yellow on MSA

The correct answer is a. Pseudomonas aeruginosa would be colorless on EMB

Explanation:

Pseudomonas aeruginosa is a gram-positive bacteria that is rod shape. It shows a few nutritional requirements and can even adapt to those conditions in which the other bacteria can be adapt.

It is non-fermentative bacteria so it does not ferment lactose and other carbohydrates. As EMB agar contains lactose and some dye, therefore, the lactose fermenting bacteria ferment the lactose and show good growth and color change.

But as Pseudomonas aeruginosa is a non-fermentative bacteria it does not ferment lactose and does not show any color and forms a colorless colony. Therefore the correct answer is a.